package main;
import java.util.Arrays;
import java.util.Scanner;

class PersonSortable implements Comparable<PersonSortable> {
	private String name;
	private int age;

	public int compareTo(PersonSortable o) {
		return this.name.compareTo(o.name);
	}

	public PersonSortable(String name, int age) {
		this.name = name;
		this.age = age;
	}

	@Override
	public String toString() {
		return name + "-" + age;
	}

}

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		PersonSortable[] stus = new PersonSortable[n];
		for (int i = 0; i < n; i++) {
			stus[i] = new PersonSortable(sc.next(), sc.nextInt());
		}
		Arrays.sort(stus);
		for (int i = 0; i < n; i++) {
			System.out.println(stus[i]);
		}
		System.out.println(Arrays.toString(PersonSortable.class.getInterfaces()));

	}
}